GROUP 1 IA PERIODICTABLEOFTHEELEMENTS18 VIIIA 1 1.0079 2 4.0026 1 H GROUP NUMBERS GROUP NUMBERS He

PERIOD IUPACRECOMMENDATION CHEMICAL ABSTRACT SERVICE HYDROGEN 2 IIA (1985) (1986) 13 IIIA 14 IVA 15VA 16VIA 17 VIIA HELIUM 3 6.941 4 9.0122 13 IIIA 5 10.811 6 12.011 7 14.007 8 15.999 9 18.998 10 20.180 2 Li Be ATOMICNUMBER 5 10.811 RELATIVE ATOMICMASS(1) B C N O F Ne LITHIUM BERYLLIUM SYMBOL B BORON CARBON NITROGEN OXYGEN FLUORINE NEON 11 22.990 12 24.305 BORON ELEMENT NAME 13 26.982 14 28.086 15 30.974 16 32.065 17 35.453 18 39.948 3 Na Mg VIIIB Al Si P S Cl Ar SODIUM MAGNESIUM 3 IIIB 4 IVB 5 VB 6 VIB 7 VIIB 8 9 10 11IB 12 IIB ALUMINIUM SILICON PHOSPHORUS SULFUR CHLORINE ARGON 19 39.098 20 40.078 21 44.956 22 47.867 23 50.942 24 51.996 25 54.938 26 55.845 27 58.933 28 58.693 29 63.546 30 65.39 31 69.723 32 72.64 33 74.922 34 78.96 35 79.904 36 83.80 4 K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr POTASSIUM CALCIUM SCANDIUM TITANIUM VANADIUM CHROMIUM MANGANESEIRON COBALT NICKEL COPPER ZINC GALLIUM GERMANIUM ARSENIC SELENIUM BROMINE KRYPTON 37 85.468 38 87.62 39 88.906 40 91.224 41 92.906 42 95.94 43 (98) 44 101.07 45 102.91 46 106.42 47 107.87 48 112.41 49 114.82 50 118.71 51 121.76 52 127.60 53 126.90 54 131.29 5 Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe RUBIDIUM STRONTIUM YTTRIUM ZIRCONIUM NIOBIUM MOLYBDENUMTECHNETIUM RUTHENIUM RHODIUM PALLADIUM SILVER CADMIUM INDIUM TIN ANTIMONY TELLURIUM IODINE XENON 55 132.91 56 137.33 57-71 72 178.49 73 180.95 74 183.84 75 186.21 76 190.23 77 192.22 78 195.08 79 196.97 80 200.59 81 204.38 82 207.2 83 208.98 84 (209) 85 (210) 86 (222) 6 Cs Ba La-Lu Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn Lanthanide CAESIUM BARIUM HAFNIUM TANTALUM TUNGSTEN RHENIUM OSMIUM IRIDIUM PLATINUM GOLDMERCURY THALLIUM LEAD BISMUTH POLONIUM ASTATINE RADON 87 (223) 88 (226) 89-103 104 (261) 105 (262) 106 (266) 107 (264) 108 (277) 109 (268) 110 (281) 111 (272) 112 (285) 114 (289) 7 Fr Ra Ac-Lr Rf Db Sg Bh Hs Mt Uun Uuu Uub Uuq Actinide FRANCIUM RADIUM RUTHERFORDIUMDUBNIUM SEABORGIUM BOHRIUM HASSIUM MEITNERIUM UNUNNILIUM UNUNUNIUM UNUNBIUM UNUNQUADIUM

LANTHANIDE Copyright©1998-2002 EniG.([email protected]) 57 138.91 58 140.12 59 140.91 60 144.24 61 (145) 62 150.36 63 151.96 64 157.25 65 158.93 66 162.50 67 164.93 68 167.26 69 168.93 70 173.04 71 174.97 (1)Pure Appl.Chem.,73 ,No.4,667-683(2001) Relative atomic mass is shown with five 6 significant figures. For elements have no stable La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu nuclides, the value enclosed in brackets indicates the mass number of the longest-lived LANTHANUM CERIUM PRASEODYMIUMNEODYMIUM PROMETHIUM SAMARIUM EUROPIUM GADOLINIUM TERBIUM DYSPROSIUM HOLMIUM ERBIUM THULIUM YTTERBIUM LUTETIUM isotope of the element. However three such elements (Th, Pa, and U) ACTINIDE do have a characteristic terrestrial isotopic composition, and for these an atomic weight is 89 (227) 90 232.04 91 231.04 92 238.03 93 (237) 94 (244) 95 (243) 96 (247) 97 (247) 98 (251) 99 (252) 100 (257) 101 (258) 102 (259) 103 (262) tabulated. 7 Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr

Editor: AdityaVardhan([email protected]) ACTINIUM THORIUM PROTACTINIUM URANIUM NEPTUNIUM PLUTONIUM AMERICIUM CURIUM BERKELIUM CALIFORNIUMEINSTEINIUM FERMIUM MENDELEVIUMNOBELIUM LAWRENCIUM